Introduction
Why do leaves change color in the fall? There are many different ways to find out why they change. One great place to search for the information is on the internet.
Task
Your task will be to help Miss Henry understand how and why leaves change color in the fall. Why are leaves green? How do leaves change color? What three main ingredients are in "tree food"? These questions will all be answered in your search. You will find a special internet site to gather the information. Once you answer the questions you will discover how and why leaves change color.
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Process
Now that you are ready to begin I have the first task for you. Click on the questions below one at a time, return to this page after each question is answered, and you will discover the information Needed.
What causes leaves to change color?
How does chlorphyll do its job?
What happens when leaves cannot drink the water?
Let's review the information we found about the leaves. Click on the questions below for the review. Don't forget to return to this page when you finish each question!
How does chlorophyll do its job?
What causes the color in the leaves to change?
With a fellow classmate, share your answers to the following questions:
1) 
What causes the color in leaves to change? (Click here)
2) 
How does chlorophyll do its job? (Click here)
3) 
What makes a leaf green? (Click here)
4) What picture represents the first step in the tree food process? Using the pictures above, explain the process in the correct order from the tree food making to the changing of the colors. Here are some questions that will help you sort things out. Answer the question in order for the proper sequence of events.
a) What is the green in the leaf?
b) How is tree food made?
c) What happens when the weather gets colder?
d) What causes the color change in the leaves?
Evaluation
|
|
Beginning 1 |
Developing 2 |
Accomplished 3 |
Exemplary 4 |
Score |
|---|---|---|---|---|---|
|
Student completes task with 90% proficiency |
Student does not apply or understand how to use clues to understand what is needed to make tree food | Student uses clues but only performs at a 50% proficiency and names 1 components of tree food | Student uses clues and discovers scientific truth for at least two of the causes and 2 components of tree food | Student uses clues for discovery of all three causes and the 3 main components for tree food | |
|
Can name the 3 causes for changing color |
Student knows 1 of the factors about changing leaves | Student can name 2 of the factors | Student can name 3 of the factors | Student can name 3 of the factors and show understanding through a reasonable explanation | |
|
New information leads to discovery question in Scientific Inquiry
|
Student is unable to relate new learned information to further questions |
Student can pose 1 knew question from new knowledge to lead into further scientific inquiry | Student can pose 2 or more questions leading to further discovery on related topics | Student uses new knowledge to make a reasonable and/or accurate prediction to related topics and poses question for further research | |
|
|
Student is unable to put the process in the proper order of events |
Student can put two parts of the process in proper sequence |
Students can put three parts of the process in proper sequence |
Student can properly put all steps of the process in correct sequential order |
Conclusion
Congratulations! You have discovered that leaves are green because of the chlorophyll packages in the leaves. The chlorophyll uses water, gas in the air (carbon dioxide), and sunlight to make food for the leaves. Leaves don't really change color, when the green chlorophyll disappears, the yellow xanthophyll and the orange carotene can now be seen! Finally your research solves, "Why leaves change color in the fall", the tree is preparing for winter!
